Bernd Klein1,2

1Max-Planck-Institut für Radioastronomie, Bonn, Germany2University of Applied Science Bonn-Rhein-Sieg, Germany

2014-03-21

01000110 01000110 01010100 01010011 – 01000010 01001011 B. Klein Polarization Workshop 2014-03-21

SpecPol:

A Polarization Core for the XFFTS

01000110 01000110 01010100 01010011 – 01000010 01001011

FFTS development history

3

1

2

2004 2005 2006 2007 2008 20092003 2010 2011 2012 2013

4

2 x 50 MHz1k channels

AFFTS:1.5 GHz, 8k channels

XFFTS:2.5 GHz, 32k channels

nextFFTS> 4.0 GHz

128k channels

XFFTS-64k:2.5 GHz, 64k channels

Acqiris-FFTS:1 GHz, 8k channels

inst

anta

neou

s ba

ndw

idth

[GH

z]

2014

B. Klein Polarization Workshop 2014-03-21

01000110 01000110 01010100 01010011 – 01000010 01001011

Fast Fourier Transform Spectrometer (FFTS)

1. Generation: AFFTS – 1.5 GHz BW, 8K channels

2. Generation: XFFTS – 2.5 GHz BW, 32K channels

XFFTS2 – 2.5 GHz BW, 64K channels

3. Generation: nextFFTS – 4 GHz BW, 128K channels+ IF sampling (4 – 8 GHz)

+ digital sideband separation

FFTS Generations

B. Klein Polarization Workshop 2014-03-21

XFFTS2 :: 64k spectral channels

01000110 01000110 01010100 01010011 – 01000010 01001011

XFFTS2: 2.5 GHz bandwidth / 65536 channels (ENBW 44 kHz)

XF

FT

S-6

4K –

2.5

GH

z / 6

4k c

han

nel

s

B. Klein Polarization Workshop 2014-03-21

XFFTS :: SpecPol-Core (full-Stokes)

01000110 01000110 01010100 01010011 – 01000010 01001011

Linear polarization

[ I

Q

U

V ] = [∣A∣2∣B∣2

∣A∣2−∣B∣2

2ℜ{AB*}2ℑ{AB*}

] [ I

Q

U

V ] = [∣A∣2 ∣B∣22ℜ{AB*}2ℑ{AB*}∣A∣2 −∣B∣2]

Circular polarization

B. Klein Polarization Workshop 2014-03-21

Norbert Tacken

AFFTS :: The Effelsberg Array-FFTS

01000110 01000110 01010100 01010011 – 01000010 01001011 B. Klein Polarization Workshop 2014-03-21